Bug#405467: linux-image-2.6.18-3-amd64: uses 100% CPU time handling hardware interrupts from parallel port

[ludovic@ludovic-brenta.org]

Package: linux-image-2.6.18-3-amd64
Version: 2.6.18-7
Severity: normal

On my HP Compaq nx6325 laptop (AMD Turion 64x2), the kernel uses 100%
of one CPU core to handle hardware interrupts (i.e. the "hi" field in
top is 100%).

As a consequence, the CPU will never scale its frequency down to 800
MHz, even with powernowd installed and running.  As further
consequences, energy consumption and heat production are abnormally
high, and battery life is abnormally low.

Unloading (with rmmod) the modules parport and parport_pc solves this
problem.  However I have to do that after each reboot.

Attached are the outputs of lspci -v, acpidump, and dmidecode, in case
that's useful.

-- System Information:
Debian Release: 4.0
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.18-3-amd64
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)

Versions of packages linux-image-2.6.18-3-amd64 depends on:
ii  coreutil 5.97-5                          The GNU core utilities
ii  debconf  1.5.11                          Debian configuration management sy
ii  e2fsprog 1.39+1.40-WIP-2006.11.14+dfsg-1 ext2 file system utilities and lib
ii  initramf 0.85e                           tools for generating an initramfs
ii  module-i 3.3-pre3-1                      tools for managing Linux kernel mo

linux-image-2.6.18-3-amd64 recommends no packages.

-- debconf information:
  shared/kernel-image/really-run-bootloader: true
  linux-image-2.6.18-3-amd64/postinst/old-system-map-link-2.6.18-3-amd64: true
  linux-image-2.6.18-3-amd64/preinst/initrd-2.6.18-3-amd64:
  linux-image-2.6.18-3-amd64/postinst/bootloader-test-error-2.6.18-3-amd64:
  linux-image-2.6.18-3-amd64/postinst/kimage-is-a-directory:
  linux-image-2.6.18-3-amd64/preinst/abort-overwrite-2.6.18-3-amd64:
  linux-image-2.6.18-3-amd64/postinst/depmod-error-initrd-2.6.18-3-amd64: false
  linux-image-2.6.18-3-amd64/preinst/lilo-initrd-2.6.18-3-amd64: true
  linux-image-2.6.18-3-amd64/postinst/bootloader-error-2.6.18-3-amd64:
  linux-image-2.6.18-3-amd64/postinst/old-dir-initrd-link-2.6.18-3-amd64: true
  linux-image-2.6.18-3-amd64/preinst/bootloader-initrd-2.6.18-3-amd64: true
  linux-image-2.6.18-3-amd64/postinst/old-initrd-link-2.6.18-3-amd64: true
  linux-image-2.6.18-3-amd64/preinst/failed-to-move-modules-2.6.18-3-amd64:
  linux-image-2.6.18-3-amd64/preinst/elilo-initrd-2.6.18-3-amd64: true
  linux-image-2.6.18-3-amd64/prerm/removing-running-kernel-2.6.18-3-amd64: true
  linux-image-2.6.18-3-amd64/preinst/overwriting-modules-2.6.18-3-amd64: true
  linux-image-2.6.18-3-amd64/postinst/depmod-error-2.6.18-3-amd64: false
  linux-image-2.6.18-3-amd64/prerm/would-invalidate-boot-loader-2.6.18-3-amd64: true
  linux-image-2.6.18-3-amd64/postinst/create-kimage-link-2.6.18-3-amd64: true
  linux-image-2.6.18-3-amd64/preinst/lilo-has-ramdisk:
  linux-image-2.6.18-3-amd64/preinst/already-running-this-2.6.18-3-amd64:
  linux-image-2.6.18-3-amd64/preinst/abort-install-2.6.18-3-amd64:

<#part type="text/plain" filename="~/lbrenta.lspci" disposition=attachment description="Output of lspci">
<#/part>

<#part type="text/plain" filename="~/lbrenta.acpidump" disposition=attachment description="Output of acpidump">
<#/part>

<#part type="text/plain" filename="~/lbrenta.dmidecode" disposition=attachment description="Output of dmidecode">
<#/part>